Average of 8 numbers is 70. If average of first four and

Let fifth and sixth numbers be 7x and 5x, respectively. So, 7x 5x 70 8 50 7 60 5 240 Or, 12x 240 Or, x 20 So, fifth number 20 7 140

last two numbers is 50 and 60, respectively then find the fifth number given that ratio of fifth and sixth number is 7:5, respectively.

A 120

B 130

C 140

D 150

E None of these

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